Caibo Deng

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Energetic electrons generated by electron cyclotron resonance heating are observed to drive instabilities in the quasihelically symmetric stellarator device. The coherent, global fluctuations peak in the plasma core and are measured in the frequency range of 20-120 kHz. Mode propagation is in the diamagnetic drift direction of the driving species. When(More)
Energetic particle physics issues are of significant interest in stellarators and rippled tokamaks. The existence and stability of shear Alfvén (SA) modes in stellarators have been examined computationally through a sequence of continuum, discrete eigenmode and δf calculations. Although 3D couplings greatly increase the number of available SA modes, many of(More)
In the test run of Shenguang III laser prototype facility, under the low density condition, the yield ratio method was used to measure the fuel areal density. Considering the uncertainty of the neutron yield, detectors with different efficiencies were used. The clear secondary-neutron signals in inertial confinement fusion experiments were obtained for the(More)
The multichannel interferometer system on the helically symmetric experiment (HSX) stellarator is reconfigured to perform far-forward collective scattering measurements of electron density fluctuations. The collective scattering system has nine viewing chords with 1.5 cm spacing. Scattered power is measured using a homodyne detection scheme. Far-forward(More)
HSX is a quasihelically symmetric stellarator with minimal toroidal curvature and a high effective transform. Experimental measurements of neoclassical currents and transport studies at 1 Tesla operation are presented. An array of magnetic pickup coils placed at two toroidal locations demonstrates that the PfirschSchlüter current is helical. Measurements of(More)
The interferometer system on the Helically Symmetric eXperiment (HSX) stellarator uses an expanded beam and linear detector array to realize a multichord measurement. Unlike conventional interferometry which determines the plasma phase shift with respect to a reference, directly evaluating the phase between two adjacent chords can be employed to measure the(More)
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